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Macrosegregation During Electroslag Remelting of Alloy 625

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An Erratum to this article was published on 18 March 2015

Abstract

A numerical model of electroslag remelting is used to examine the effects of ingot diameter, mushy zone permeability, process current levels, and initial composition on macrosegregation in alloy 625. Composition variations are made within the standard ranges for alloy 625 to alter the solutal contribution to buoyancy-driven flows and macrosegregation. Average steady-state macrosegregation and radial composition distributions are compared to identify processing conditions that best ameliorate this defect. Also, a novel approach to evaluate macrosegregation of an ingot is used, comparing the composition distribution to the alloy specification. As expected, increasing the ingot size from 51 cm (20 in.) to 76 cm (30 in.) increases the overall segregation, especially at the centerline. The segregation tends to decrease with decreasing interdendritic liquid velocity and sump depth. Processing ingots with a low current and an initial composition in the low end of the specification range is the best choice to reduce macrosegregation.

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Acknowledgments

This research was funded by a gift from PCC and by a grant from the National Science Foundation (CMMI-0900624), the latter being a GOALI award in partnership with Special Metals Corporation (a PCC subsidiary) and Haynes International.

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Author notes

  1. Jeffrey Yanke (Graduate Research Assistant)

    Present address: Carpenter Technology Corporation, Reading, Pennsylvania, USA

Authors and Affiliations

  1. Purdue Center for Metal Casting Research, School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, IN, 47906, USA

    Kyle Fezi (Graduate Research Assistant), Jeffrey Yanke (Graduate Research Assistant) & Matthew John M. Krane (Associate Professor)

Authors
  1. Kyle Fezi
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  2. Jeffrey Yanke
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  3. Matthew John M. Krane
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Correspondence to Kyle Fezi.

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Manuscript submitted October 20, 2013.

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Fezi, K., Yanke, J. & Krane, M.J.M. Macrosegregation During Electroslag Remelting of Alloy 625. Metall Mater Trans B 46, 766–779 (2015). https://doi.org/10.1007/s11663-014-0254-1

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